"We are now at about 8 million estimated users and still growing at about 100 percent a year. We haven’t passed Java in terms of users yet, but by this time next year at the current growth, we will surpass."

It's not clear whether 'user' means node.js developer or someone deploying the software or something else altogether. It's also not stated where this number came from, and I'd imagine it would be fairly difficult to measure anyway.